Practice Real Company Assessment Patterns • Latest 2025–2026 Mock Tests

Programming Exercises

Flatten a nested list

Easy

Problem Statement

Flatten a nested list

Sample Input

[[1, 2], [3, 4], [5, 6]]

Sample Output

[1, 2, 3, 4, 5, 6]

Limits

Time: 2s · Memory: 256 MB

Code Editor
00:00
import java.util.*; public class Main { public static List<Integer> flattenList() { List<List<Integer>> nestedList = Arrays.asList( Arrays.asList(1, 2), Arrays.asList(3, 4), Arrays.asList(5, 6) ); // Your code here return new ArrayList<>(); } }
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Input
[[1, 2], [3, 4], [5, 6]]
Expected Output
[1, 2, 3, 4, 5, 6]